Reversing mechanism



.ANN

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A c. o. GUERNSEY REvERsI'NG MECHANISM Filed May 4, 1925` s sheets-sheet' s Patented Mar. 27, 1928.k

UNITED srrs s j ttete CHARLES O.A GUERNSEY, OF PHILADELPWIIIA, PENNSYLVANIA.

IREVERSING MECHANISM.

Application led May 4,

A reversing mechanism embodying the invention is specially applicable for use on railway carsf or coaches in which power is transmitted from a transmission mechanism on the car truck tosone or to both of the coach axles. In a coach of this type it is desirable to mountlthe reversing mechanism directly on .the axle so that the transmission mechanism may always rotate inthe same direction. l

More particularly, the invention relates to a reversing `mechanism of the bevel gear type in which the driven gears are shifted axially into and out of mesh with the driving pinion. The principal object of the invention is to provide a simple and improved means whereby the adjustment or shifting of the driven gears may be effected. y Further objects of the invention'will be apparent fromV the following specification and claims.

In the accompanying drawings I have shown the embodiment of the invention which I now deem preferable but it will be understood that the drawings are'for` illustrative purposes only `and vthat various changes Vand substitutions may be made u withinthe scope ofthe claims without demay be the axle :of acoach truck.

parting from the spiritfof the invention.

Of the drawings: l

Fig. 1 is -a horizontal sectional view through a reversing mechanism embodying the invention. l,

Fig. 2 is a vertical sectional View` ltaken along the line 2--2 of Fig. 1.

Fig. 3 is a fragmentary vertical ,sectional viewtaken along the line 3 3 of Fig. 1.

Fig. 4 is a right hand end view.v Y

Fig. 5 is a bottom view showing the oper ating linkage. i

Referring particularly to Fig. .1`of the drawings, 1 represents a driven shaftfwhich In the case of an axle it will be understood that coach wheels are mounted at the ends thereof and that the axleis Aengaged by suitable bearings which .support the frame of the coach. Inasmuch as these parts are not involved in the present invention, they areV not shown.. Y l

Supported on the drivenvshaft oraxle 1 is a housing 2 which preferably comprises -upper and lower sections 3 ,and 4. A suitable 1925. seriai No. 27,908.

strut is provided for preventing the housing from turning on` the shaft, or axle and-as pose to be described. These bearing surfaces V8, 8 are partly on the upper section 3 of the housing and partly on caps), 9- secured to the upper section by means vof bolts 10, ,10. The lower section 4 of the housing is readily detachable from the upper section to provide access to theinterior andit is held in place by bolts 11, 11. The lower section 4 is cut away to provide room for the caps 9, 9 and packing is providedin grooves' at 12, 12 to prevent the escape of oil through the ,spaces 'between the lower section and thebearing caps. An-openingA is provided at 13 Yfor pouring oil into the casing anda drain plug is provided at 14. 1

- Mounted lin the casing for rotation about an axis which is at angle,y usually a right angle, to the driven shaft, is a driving shaft carrying a bevelY pinion 15. Preferably.l as shown the bevel gear 15 and the shaft are formed yintegrally 'and the shaft is mounted in bearings 16 and 17. As illustrated the bearing 16 is of the tapered .roller type and is carried by a plate 18 which covers an opening in the housing. The bearing .17' is of the straight roller type and Iis mounted in a vertically extending rib 19 formed integrally with the uppersection 3 of the housing. 2O is a suitable drive member secured to the end of the bevel gearshaft, and this may, for instance, be one element of a uni-` versal joint.

vSlidably mounted on the shaft 1 within l the housing is a gear unit comprising two connected bevel gears 21 and 22, each adapt#v ed to mesh with the bevel pinion 15. These two gears are rigidly connected together and preferably they are bolted to anges formed on a slidable sleeve 23; As illustrated the shaft 1 and the sleeve 23 are both formed lat 24 with integral teeth orI keysV extending longitudinally and adapted to engage with each other to permit longitudinal sliding of the sleeve and to prevent relative rotative ment but is movable endwise.

movement. As shown in Fig. 1, the gear 21 is in mesh with the pinion 15 and with the parts so positioned power will be transmitted from the driver 20 to rotate the shaft 1 in one direction. It will be obvious that by sliding the sleeve 23 the gear 21 can be moved out of vmesh and the gear 22 moved into mesh. With-the parts in this second position power will be transmitted from the driver 20 to rotate the shaft 1 in the other direction.

In accordance with my invention novel devices are provided for shifting the sleeve 23 together with the gears 21 and 22.V Cam means are provided at each end of the gear. unit for moving the unit axially, and preferably these cam'devices are rotatable about the laxis of the driven shaft. As shown there are interposed between each bearing surfaces ofthe housing and they corresponding 'part ofthe driven shaft two annular members orV rings 25 and 26. The constructionat the right hand end will. be described but it will be understood that the construction at'the lefthand end is similar except for the reversal of parts. ofthe rings 25 and 26 contact directly with bearing surface 8 of the housing and the `rings also serve -as bearing members for the shaft 1. Preferably for'this purpose the inner sur'faces of the ringsfengage a bearing lbushing 27 which 1s preferably provided with a iange 27a at the inner end. This flange 27a is adapted -to engage a bearing washer. 28 secured to the end of the sleeve 23. Preferably a bushing 29 is interposed between the sleeve 27 and the axle, this being provided for structural reasons to permit the assembly of the various parts.

The ring 25 is held against rotative 'movep The pre ferred 'means for holding this ring is shown in Fig. 3. As illustrated the ring is' made in two parts held together by bolts 30., 30. Clamped between the two parts of the ring are key plates 31, 31 which extend outward into longitudinal slots in the housing! The bearing sleeve`27 is preferably' alsoformed in two parts and the said key plates 31, 31 extend inward between the two parts of the said sleeve. This construction not only serves to prevent the ring 25 from turning but it also prevents the bearing bushing from turning.

The ring 26 constitutes a cam and it is preferably formed in one piece and is rotatable to a limited extent between the bearing surface 8 of the housing and the outer surface of the bearing sleeve 27. This ring is held against` outward axial movement by means of a ring 32 which ,issecured to the housing. Connected with the outer end of the Vcam ring 26 is a ring 33 which carriesan operating-lever 34 as shown in Fig. 4. Also connected with the end of the ring 26 and yadjacent the ring 33 is a bushing 35. This* The outer surfacesv moved endwise carrying the sleeve 23 and the gears 21 and 22 .with it. The proportions of the cam teeth are' such lthat when the teeth at the right hand side are fully interengaged as shown inFi'g. 1,`the gear 21 will be in proper mesh with thel pinion 15. When the cam ring 26 at the right hand side has beenmoved so that thetops ofthe teeth arev in contact, the gear 22 will beV in proper mesh with vthe pinion/15. In order `that the ring 26 maybe adjusted axially'in order to insure the proper-mesh between the gear and the pinion, I prefer lto provide 'one or more shims 32a between thering 32 'and the housing. By removing the'shim, or by replacing it with another, the position of the ring can be adjusted axially soas'to properly control the meshing of the gear and pinion.

It will be understood that a" construction similar to that already described inV detail is provided at the left hand end'of the casing and that the two rotatable cams are connected for movement in proper timed relation., As shown the tops of the teeth 37 and 38 at the left are in engagement and the gear 21 is thus held in proper engagement with the pinion.l By rotatingthe left hand cam 26a in the clockwise direction (as viewed from the right) and by rotatingthe cam 26 in the counter-clockwise direction, the sleeve 23 will be moved to bring the gear 21l out of mesh and the gear 22 into mesh. It will be noted that thefspaces between the bottoms of thecam teeth are wider than the tops of the mating teeth. This permits one of the cams 26 or 26m, in this case the left hand cam 26a, to move far enough to release the teeth onthe corresponding ring 25Wbefore the ring 25 atthe right starts to move axially. I

As shown in Figs. 4 and 5, the operating levers 34 and 34m for the two cam rings 26 and 26a are connectedbymeans of links 41 and 42 with a lever 43 which is pivoted to the casing for movement about a vertical pivot at 44. Any suitable mechanism may beA provided for operating the levers and links as described.'` 45' projecting from one of the rings 33 and connected with a reach rod 46. It willv be understood that thisreachA rod is connected with anysuitable mechanism for adjusting or shifting the reversing mechanism; i

Iv have shown an arm What I claim is:

.ion on the driving shaft; a gear unit on the driven shaft comprising a sleeve and two bevel gears carried thereby, the said unitV being axially movable to bring either of the gears into mesh with the pinion and the other out of mesh; two axially movable nonrotatable rings located at the respective ends of the gear unit and adapted to determine the longitudinal position thereof, the said rings having at their outer ends cam teeth with flattops and having flat surfaces between tlie teeth at the bottom thereof; two cam rings rotatable about the axis of the driven shaft and having cam teeth adapted to engage respectively with the cam teeth on the non-rotatable rings, the teeth of the cam ringsalso having fiat tops and the rings having flat surfaces between the teeth at the bottoms thereof; and means whereby the said cam rings may be adjusted axially.

2. A reversing mechanism comprising in combination a driving shaft and a driven shaft at an angle to each other; a bevel pinion on the driving shaft; a gear unit on the driven shaft comprising a sleeve and two bevel gears carried thereby; the said unit being axially movable to bring either of the gears into mesh with the pinion and the other out of mesh; two axially movable nonrotatable rings located at the respective ends of the gearl unit and adapted to determine the longitudinal position thereof, the said rings having at their outer ends cam teeth with flat tops and having flat surfaces between the teeth at the bottoms thereof; two cam rings rotatable about the axis of the driven shaft and having cam teeth adapted to engage respectively with the cam teeth on the nonsrotatable rings, the teeth of the cam rings also having fiat tops and the rings having flat surfaces between the teeth at the bottoms thereof; and means including removable shims whereby the said cam rings v may be adjusted axially.

3. A reversing mechanism comprising in combination a driving shaft and a driven shaft at an angle to each other; a bevel pinion on the ydriving shaft; a gear unit on the driven shaft comprising a sleeve and two bevel gears carried thereby, tliersaid unit being axially movable to bring either of the gears into mesh with the pinion and the other out of mesh; two axially movable non-rotatable rings located at the respective ends of the gear unit and adapted to determine the longitudinal position thereof, the said rings having cam faces at their outer ends; two cam rings rotatable aboutthe axis of the driven shaft having cam faces respectively adapted to engage the cam faces 'of the non-rotatable rings; and a housing enclosing the said gears and having fbearingengagement with the outer surfaces of the aforesaid `rings independently of the driven shaft.`

4. A reversing mechanism comprising in combination a driving Vshaft and a driven-v Vshaft at anangle to each other; a bevel pin- Vvion on the driving shaft; a gear uniton the driven shaft comprising a slee-ve and two bevel gears carried thereby, the said unit being axially movable to bring either ofthe gears into mesh with the pinion and the other out of mesh; two axially movable non-rotatable rings located at the respective ends of the' gear unit and adapted to determine the longitudinal positionthereof, the said rings `having cam faces at their outer ends; two

cam rings rotatable about the axis of the driven shaft having cam faces respectively adapted to engage the cam faces of the non-rotatable rings; a housing enclosing `the said gears and having bearing engagement with the outer surfaces of the aforesaid rings independently of the driven shaft; means engaging the housing for preventing the rotation of the first said rings; and means extending outside ofthe housing for turning the second said rings.

5. A reversing mechanism comprising in combination a driving shaft' and a driven shaft at an angle to yeach other; a bevel pinion on the driving shaft; a gear unit on the driven shaft comprising a sleeve and two bevel gears Acarried thereby, the said unit being axially movable tobring either of the gears into mesh with thepinion and the other out of mesh; two axially movable non-rotaty able rings located at the respective ends of the gear unit and adapted to determine the longitudinal position thereof, the said rings having cam faces at their outer ends; two

cam rings rotatable about the axis ofthe f 6. A reversing mechanism 'comprising in combination a kdriving shaft and a driven shaft at an angle to each other a bevel pinion on the driving shaft; a gear unit on the bevel gears carried thereby, the said unit being axially movable to bring either 'of the gears into mesh with the pinion and the other out of mesh; two axially movable iion-rotat able rings located at the respective ends of the gear unit and adapted to determine the longitudinal position thereof, the said rings having cam faces at their outer ends and be-y -driven shaft comprising a sleeve and two.

ing each formed in two parts separated along aforesaid rings independently of the driven an axial plane; tWo cam rings rotatable a'loout shaft; means held between the tWo parts of the axis of the driven shaft having cam faces the respective axially movable rings for 4en- 10 respectively adapted to engage the cani faces gagingV the housing to prevent rotation of 5 of the non-rotatable rings; a housing enclossaid rings and means for turning the second ing the said gears and having bearing ensaid rings. gagement with the outer surfaces of the `CHARLESO- GUERNSEY. 

